While I know that I am in the tiny percentage of the population who has a strong negative reaction to the Methacholine Challenge test, I want to offer one caveat. About six years ago, I had chronic cough and my doctor thought I might have asthma so he had me take the Methacholine Challenge test. Taking the test turned my, as yet unknown, asthma into moderate-to-severe persistent asthma. Hope no one else has this experience but it is something to consider.
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